Mo v lines (left panel, marked with their wavelengths from Table A.11 in Å, green) and Mo vi lines (right panel, marked blue, wavelengths from Table A.12) in the FUSE (for lines at λ< 1188 Å) and HST/STIS (λ> 1188 Å) observations of RE 0503−289. The synthetic spectra are convolved with a Gaussian (full width at half maximum = FWHM = 0.06 Å) to simulate the instruments’ resolutions. Other identified photospheric lines are marked in black. The thick red and thin green lines show a comparison with theoretical spectra of two models with and without Mo, respectively. The vertical bar indicates 10% of the continuum flux.